JPS5856587Y2 - rice cooker - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rice cooker that allows rice to be cooked and rice to be evenly mixed after the cooking is completed in a good condition, so that delicious rice can be cooked.

Embodiments of the present invention shown in the drawings will be described in detail below.

First, in FIGS. 1 and 2, reference numeral 1 denotes a rice cooker main body composed of an exterior body 2, an outer pot 3, a heat insulating material (not shown) interposed between the two, an annular upper casing 4, etc.; is an inner pot that is housed in the rice cooker main body 1, that is, in the outer pot 3, so that it can be moved in and out.

Therefore, this inner pot 5 is attached to the upper frame 4 at the upper end of the rice cooker main body 1.
An upper edge flange 5a is sealed on top, and the flange 5a is used to suspend and support the inside of the outer pot 3, and between the inner surface of the outer pot 3 and the inner surface of the outer pot 3, there is an area extending from the circumferential side to the bottom. A space 6 in a substantially sealed state is formed.

7 is an inner lid that closes the opening of the inner pot 5; 8 is an outer lid that covers the outside of the inner pot 7; 9 is a thermal response device that detects the bottom temperature of the inner pot 5 to detect the completion of rice cooking; As is well known in the art, it is set by an external operation in conjunction with the rice cooking switch 10, and operates to open the rice cooking switch 10 when rice cooking is completed.

11 is a lower heater provided at the inner bottom of the outer pot 3 without contacting the inner pot 5; 12 is a side heater provided at the circumferential interface of the outer pot 3; and 13 is a heater provided on the outer surface of the outer pot 3 during rice cooking operation. and a thermoswitch for unevenness that senses the temperature change in the space 6 after the rice cooking operation has stopped, and closes during the rice cooking operation and opens at a temperature higher than the heat retention temperature, and 14 is a thermal switch that also senses the temperature change in the space 6. Reed switch (thermal temperature control means)
It is.

Therefore, the electric circuit of the rice cooker is as shown in FIG. 2, in which the lower heater 11 and the rice cooking switch 10 are connected in series to the power source.
A series circuit of a side heater 12 and a thermoswitch 13 is connected in parallel to the rice cooking switch 10, and a thermal reed switch 14 is further connected in parallel to the thermoswitch 13.

Next, its effect will be explained.

Now, when the rice cooking switch 10 is closed by external operation of the heat-responsive device 9 and power supply to the lower heater 11 is started, since the inner pot 5 is not in contact with the lower heater 11, the radiant heat from the lower heater 11 is The atmosphere in the space 6, which rises to a high temperature due to the heat generated by the lower heater 11, heats the rice in a way that wraps it all around, and cooking progresses.

When the rice cooking is completed, the rice cooking switch 10 is opened by the action of the thermal response device 9, and the rice cooking operation immediately shifts to the next step, the uneven heating operation.

That is, when the rice cooking switch 10 is opened, the lower heater 11. A series circuit of side heater 12 and thermoswitch 13 is immediately formed.

In addition, in this circuit, the resistance value of the side heater 12 is the same as that of the lower heater 1.
Since the resistance value is much greater than the resistance value of 1, the lower heater 11 hardly generates heat, and uneven heating is performed exclusively by the heat generated by the side heater 12.

Of course, the calorific value of the side heater 12 at this time is set to be smaller than the calorific value of the lower heater 11 during rice cooking.

Therefore, the uneven heating of the rice by the side heater 12 is carried out in such a way that the inner pot 5 is enveloped from all sides by the atmosphere of the space 6, and although the temperature of the rice falls, the rate of fall is gradual. This means that the condition of preventing the temperature of the rice from rapidly dropping for about 15 to 20 minutes after the completion of cooking, which is the condition of unevenness, can be satisfied.

Therefore, the gelatinization of starch is promoted, and since the inner pot 5, that is, the rice content, is heated in such a manner that it is wrapped around the entire circumference, there is no possibility of local excess moisture.

In addition, when the side heater 12 does not generate heat and uneven cooking is performed by natural cooling, the temperature drop rate of the rice changes depending on the outside temperature, so it is not possible to obtain good uneven cooking conditions.

In this way, the unevenness of the rice progresses, and when the thermo switch 13 detects the completion of unevenness due to temperature change and opens, the lower heater 11. A heat retention circuit consisting of a side heater 12 and a thermal reed switch 14 is formed.

However, at the initial stage, the temperature of the rice is much higher than the keep-warm temperature, so the reed switch 14 is in an open state, and it closes only when the temperature of the rice drops to the keep-warm temperature. The temperature of the rice is maintained at a constant temperature by controlling the electricity supplied to the rice cooker.

As mentioned above, when cooking rice, the inner pot 5 is heated in such a way that it wraps around the entire circumference, so that the rice is evenly cooked, and the rice is kept in an ideal state without any unevenness, and there is no risk of localized excess moisture. You will be able to eat delicious food.

FIG. 3 shows an electric circuit diagram of another embodiment of the rice cooker of the present invention, in which the side heater is divided into two heaters, one for uneven heating and one for heat retention.

In other words, a series circuit of the irregularity thermoswitch 13 and the irregularity side heater 12a, and the thermal reed switch 14
and a series circuit of the heat-retaining side heater 12b are connected in parallel to the rice cooking switch 10, respectively.

In the present invention, the side heater 12 may be connected in parallel to the series circuit of the rice cooking switch 10 and the lower heater 11 so that the side heater 12 generates heat even during the rice cooking operation.

As described above, the rice cooker of this invention senses the temperature change during the rice cooking operation and after the rice cooking operation has stopped using the outer surface of the outer pot. With an extremely simple configuration that includes a thermoswitch for heating and connecting this thermoswitch for heating in series to the side heater, the side heater can perform uneven heating, making the unevenness of rice less dependent on the outside temperature. It is very good because it is always in good condition without being heated, and delicious food can be obtained, and there is no need to waste power by continuing the uneven heating operation by the side heater more than necessary. .

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional configuration diagram of the rice cooker of the present invention, FIG. 2 is an electric circuit diagram thereof, and FIG. 3 is an electric circuit diagram of another embodiment of the rice cooker of the present invention. 3: Outer pot, 5: Inner pot, 6: Space, 7: Inner lid, 8: Outer pot,
10: Rice cooking switch, 11: Lower heater, 12: Side heater, 13: Thermoswitch for uneven heating, 14: Thermal reed switch (heat retention temperature control means).

Claims (1)

[Scope of utility model registration request] It has an outer pot, an inner pot that can be moved in and out of the outer pot, an inner lid that closes the opening of the inner pot, and an outer lid that covers the outside of the inner pot, and has both the functions of cooking rice and keeping it warm. The rice cooker is equipped with an uneven thermoswitch that senses temperature changes during the rice cooking operation and after the rice cooking operation has stopped, and closes it during the rice cooking operation and opens at a temperature higher than the heat retention temperature after the rice cooking operation has stopped. The thermoswitch for uneven heating is provided on the outer surface of the pot, and is connected in series to the side heater located on the peripheral side of the outer pot, so that after the rice cooking operation, the uneven heating operation is performed by the side heater. A rice cooker.